mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

21 December

This year, I posted instructions for making a dodecahedron and a stellated rhombicuboctahedron.
To get today's number, multiply the number of modules needed to make a dodecahedron by half the number of tube maps used to make a stellated rhombicuboctahedron.

Show answer

Folding tube maps

Back in 2012, I posted instructions for folding a tetrahedron from tube maps. When tube maps are used, the sides of the tetrahedron are not quite equal. What ratio would the rectangular maps need to be in to give a regular tetrahedron?

Show answer & extension

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

ellipses square roots rectangles integers volume dodecagons complex numbers means pascal's triangle menace products 2d shapes crossnumbers cube numbers probability palindromes sport numbers number chess functions multiplication calculus median crosswords speed chalkdust crossnumber bases partitions people maths sums regular shapes percentages coins games routes unit fractions digits irreducible numbers logic sequences spheres graphs angles dice factors trigonometry triangle numbers squares shapes wordplay digital clocks taxicab geometry star numbers coordinates planes 3d shapes surds mean prime numbers cryptic clues rugby perimeter scales differentiation ave chocolate square numbers addition algebra integration averages crossnumber cards time remainders clocks symmetry proportion sum to infinity hexagons advent factorials colouring triangles doubling grids dates floors the only crossnumber parabolas cryptic crossnumbers indices books probabilty balancing christmas gerrymandering quadratics fractions odd numbers range shape polygons area elections money arrows multiples lines tiling dominos circles division geometry perfect numbers folding tube maps

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020